Liquid fuel supply mechanism for oil stoves



Jan. 9, 1940. D. H. LAPolN'rE LIQUID FUEL SUPPLY MECHANISM FOR 0.1L STOVES 'Filed Feb. l2, 1938 2 Sheets-Sheet P.

INVENTOR DONALD H. LAPO/NTE ATTORNEY Patented Jan. 9, 1940 UNITED vsir-Artis OIL STOVES LIQUiD FUEL SUPPLY MECHANISM Foa Donald H. Lapointe, Meriden, Conn., assigner to The` Miller Company, Meriden, Conn., a. corporation of Connecticut l y Application February 12, 1938, Serial No. 190,145

4 Claims. (Cl. 103-213) The present invention relates to liquid fuel l supply mechanism for oil stoves, and is more particularly directed toward supply systems for oil stoves adapted to elevate the liquid fuel from 5 a low level supply tank to a reservoir above the level of the burners and to supply the fuel from this reservoir to burners. l

The present invention contemplates an electrically operated pump by which fuel can be l drawn up into a reserve chamber or reservoir from which it is fed down through suitable float valves so as to be supplied to the burners,

The accompanying drawings show, for purposes of illustrating theA present invention, one l of the many embodiments in which the invention may -take form, it being understood thatthe drawings are illustrative of the invention rather than limiting the same.

In these drawings:

Figure 1 is a vertical sectional view taken on the line I-I of Figure 4 and illustrating diagrammatically the outflow pipes and connections;

Figure 2 is a front elevational view of an oil stove having burners at two levels; l

Figure 3 is a top elevational view of the oil pump with the tank in section;

Figure 4 is a vertical sectional view on the line 6--4 of Figure 1;

Figure 5 is a fragmentary sectional view on B0 the line 5-5 of Figure l;

Figures 6 and 6A are diagrammatic views illustrating the operation of the gear trahi taken in the direction of the arrows 6 of Figure 4;

Figure 'l is an enlarged sectional view on the l5 line 'I-I of Figure 4; and

Figure 8 is a section taken on the line 8--8 of Figure 7. In Figure 2 a stove is illustrated having upper burners I0 adapted for-cooking on top of the u) stove and lower burners II adapted for operating an oven. The burners I0 are connected by a pipe I2 with a fuel supply basin -or tray I3, while the burners II are connected by a pipe I4 with a tray or basin I5. Fuelis adapted to be :5 supplied to these basins by pipes indicated at I6 and I'I, float valves I8 and I9 being employed to prevent ooding. The pipes I6 and I'I are connected into a reservoir 20 which may be made of sheet metal and placed in any convenient part 0 of the stove. A suction line is indicated at 2l and an overflow drain system is indicated at 22. A supporting plate 24 is suitably secured across the top of the tank or reservoir 20. This plate carries a base plate or casting 25 for supporting 5 the operating mechanism for pumping the fuel.

This mechanism, as here shown, consists of a small electric motor 26 whose shaft 2'I is"dis' posed angularly with respect .to a large driving gear 28. The shaft 2l carries a single tooth pinion 29 on its free end.y This pinion is ap- 6 proximately spiral shaped, so that at any one time it can engage with only one of the `teeth 30 of the large gear 28. In this manner a very great reduction in ,speedy is obtained with a very simple mechanism. The circuit for the motor is 10 under the control of a switch, indicated generally at 3|, and this switch in turn is under the control of mechanism 32 operated by a float 33.

rIhe gear 28 is mounted on a shaft 35 suitably secured in the casting forming the plate l5 25. The gear extends down intov a well like portion 36 of this casting and carries cam members indicated at 31 and 38. These cam members receive a roller 39 carried on the downwardly extending end 40 of a lever 4I which is pivoted 50 at 42 lto the casting 25. The cam acts to rock the lever 4I back and forth as the large gear 28 is revolved. The lower end 43 of the lever 4I is connected to piston rod 44 which operates the plunger 45 of a suction pump. The cylinder 46 25 of this pump, together with valve mechanism, indicated at 41, is suitably secured to a bracket arm 48 extending down from the upper part of the casting A25. This valve mechanism includes a ball check valve, indicated at 49, which is in 80 communication with the suction line 2| and a spring operated ball valve, indicated at 50,

through which the fuel is discharged on the return stroke of the piston.

In operation the motor is controlled through 85 the switch which in` turn is actuated'by the float mechanism. When the motor operates to drive the pump fuelr is drawn up through the suction line and is drawn up through the reservoir or tank 20 until the iioat mechanisml closes 4,0 the switch. The fuel then runs ydown through the supply lines to the burners. The arrangement shown provides a convenient and effective mechanism with few moving parts for the purpose of pumping the oil into the reservoir, and also 45 makes it possible to use gravity feed for oil to burnersat varying heights.

It is obvious that the invention may be embodied in many forms .and constructions within the scope of the claims and I wish it to be under- 50 Vstood that the particular form shown is but'one of the many forms. Various modifications and changesy being possible, I do not otherwise limit myself in any way with respect thereto.

What is claimed is: y

1. A fuel pumpfor oil stoves comprising a tank, a frame plate secured across the top of the tank, an electric motor secured to the plate with its axis horizontal and spaced above the plate, a pinion carried by the motor shaft, a large gear rotatably carried by the plate and meshing with the pinion, a cam carried by the gear, a lever arm pivoted to the frame plate and having its upper end co-operative with the cam, a stationary pump cylinder, and a plunger disposed in the cylinder and operated by the lower end of the lever arm.

2. A fuel pump such as claimed in claim 1, wherein the motor shaft and the pinion axis are both horizontal but out of parallelism, the pinion is a single tooth spiral and the large gear has its teeth on the side facing the motor.

3. A fuel pump comprising a horizontal supporting plate having an upwardly opening gear receiving well, a gear in the well, a cam on the face of the gear, an electric motor secured to the top of the plate and having a pinion in mesh with the gear to drive the gear, a. lever arm pivoted to the lower part of the well and having its upper end extending over into the well, to engage the cam, the frame also having a downward extension, an inlet valve and pump cylinder secured to the extension, and a piston carried in the cylinder and connected to the lower end of the arm for actuation thereby.

4. In a fuel pump, an electric motor having a single tooth spiral pinion on the end of the shaft thereof, a cam gear mounted on an axis out of parallelism with the motor shaft but in a plane parallel with a plane through the motor shaft axis, the cam gear having peripherally dls,

posed teeth extending from one face thereof to mesh with the spiral pinion, and a cam on the opposite face, a pump plunger operated from the cam, and a pump cylinder into which the plunger extends.

DONALD H. LAPOINTE. 

